来自Swift Xcode 6中的应用程序的iPhone调用

I checked and tried previous answers on how to make call directly from the app but I keep getting errors. I just made a button in the storryboard and hooked it up to the view controller. It keeps giving me the ERROR Excpected ',' separator but that doesn't solve anything. Do I need to add code to the AppDelegate or anything else? I really would like to know the way to do this in Swift.I checked and tried previous answers on how to